Handle base



FIG. 1 is a perspective view of a handle base showing my new design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a first side view thereof;

FIG. 6 is a second side view thereof; and,

FIG. 7 is a third side view thereof.

The broken lines showing portions of the handle form no part of the claimed design. 

CLAIM The ornamental design for a handle base, as shown and described. 